Drag your window by set a UIElement as a Drag Region
SetDragMove
| 1 | DragMoveAndResizeHelper.SetDragMove(window, element); | 
UnsetDragMove
| 1 | DragMoveAndResizeHelper.UnsetDragMove(element); | 
Demo
you can run demo and see this feature.
Drag your window by set a UIElement as a Drag Region
| 1 | DragMoveAndResizeHelper.SetDragMove(window, element); | 
| 1 | DragMoveAndResizeHelper.UnsetDragMove(element); | 
you can run demo and see this feature.